Gas-engine.



No. 870,240. PATENTED NOV. 5, 1907. D. LIBBY, JR. GAS ENGINE.

APPLICATION FILED T12R25, 1905.

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UNITED STATES IZATENT OFFICE.

DORVILLE LIBBY, JR, or SAN FRANCISCO, CALIFORNIA, ASSIGNOR ro'rnn SUNSET Auro- MOBILE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

GAS-ENGINE.

Specification of Letters Iatent.

Patented Now-5, 1907.

Application filed February 25. 1905. Serial No. 247,334-

county of San Francisco and .State oi California, have invented certain new and useful Improvements in Gas- Engines, of which the following is a specification, reier- My invention relates to improvements in gasengines, and pertains particularly to that class known as twocycle engines,

In the accompanying drawings, Figure 1, is a vertical longitudinal sectional view of the engine cylinder showing the charge compressed and ready to be exploded. Fig. 2, is a vertical longitudinal sectional view showing the charge entering the cylinder above the piston through the cap carried thereby. Fig. 3, is a. transverse sectional view taken on the line x x of Fig. 2. l

Referring now to the drawings, A represents a cylinder which as is the usual case, is cast and provided with the laterally extending radiating blades or wings b, thus preventing the cylinder from becoming too intensely heated, and obviating the use of the ordinary water-cooling jacket most commonly used for cooling the cylinder. The said cylinder A is provided with the closed upper end B which is provided with a screw- ,threaded opening B into which it screwed any ordinary form of sparking plug, while the opposite end 0 of the cylinder is open, as clearly shown. The said cylinder intermediate its ends, is provided with an outwardly extending flange D which has its end turned downward. The said cylinder below the flange D is provided with a series of exhaust openings E entirely surrounding the cylinder, and a short distance below saidexhaust openings the cylinder is provided with a series of inlet openings F entirely surrounding the cylinder in this way obtaining a very large port area without losing much of the effective stroke of the engine. The cylinder between theexhaust and the inlet openings, is provided with a circumferential screw-threaded portion G-upon which is screwed a casing H which is provided with the outwardly and upwardly extending flange I which interlocks with the flange D, and forms the exhaust chamber or mufiier .I which is in communication with the exhaust openings El The downwardly extending portion of the casing surrounds the cylinder A and is spaced a slight distance therefrom, thus forming the space K through which the explosive mixture passes from the crank case through the inlet openings F above the piston, as hereinafter more fully described. Thus'by this structure, it will be-readily seen that the cylinder A can be readily unscrewed from the casing .H, exposing both the inlet and exhaust openings surrounding the cylinder, whereby they may be readily cleaned. The lower end of the casing H is connected to and in communication with the air-tight crank casing L, and in said casing the charge is compressed during the downward stroke of the piston, and from this it escapes through the passages K to the cylinder. The said crank casing L is provided with the usual inflammable vaporinletvalve which is opened by the upward stroke of the piston, andjclosed'by the downward stroke, and need not be further described, and the lower end of said cylinder, as clearly shown, is open and in full communication with the crank casing L.

The piston M may be of any desired structure, but ispreferably hollow as shown, and provided with any desired packing m and extending into the piston is the piston rod N which is mounted upon the rod or bolt 0 within the same, and the lower end of the piston rod is connected to the crank P mounted within the crank casing L. As shown, the upper end Q, of the piston is of a slightly conical shape, and cast with said piston is a corresponding conical cap B, said cap being supported at a little distance abovethe conical end Q of the piston by ribs 1 which form inwardly extending passages S from the side of the piston, and said passages communicate with the central opening R in the cap R, the-purpose of which I will nowproceed to describe.

The piston when in the position shown in Fig. 1 is ready to be acted upon by. the explosion and the explosion of the gases above causes the piston to travel downward and compress the mixture, within the crank casing. The continual downward movement of the piston brings the passages S in communication with the exhaust ports E of the cylinder and the exhaust passes from the cylinder. The piston continuing to travel downward brings the end thereof below the exhaust ports E and said openings completely surrounding the cylinder, it is readily seen that the cylinder is thoroughly exhausted; A still further downward movement of. the piston brings the passages S in the conical cap opposite the inlet openings F and the compressed mixture rapidly passes through the passages K and through the inlet openings F and through the passages S in the end of the piston, and is discharged centrally therefrom through the opening R in the cap R within the center of the cylinder.

The explosion takes place when the piston is at the end of the compression stroke, and this piston travels downwardlyuntil the passages S in the piston register with the exhaust ports E where the gases pass from the cylinder through their own expansion. The continued downward movement of the piston brings the passages S in communication with the inlet openings F. When hole in the cap in a solid column, which then proceeds to the top of the cylinder and fills the same from the top downward, any exhaust gases therein being forced out througn the exhaust openings by the downward rush of charge and effectively preventing mixture of the exhaust and charge as well as preventing the direct movement of the piston compresses the charge. This arrangement of ports and deflecting cap isespecially effective in engines of relatively short stroke, high cylinder compression, and high crank-case compression.

In two cycle engines of this character, when running at a high rate of speed, it has been found very essential to arrange the exhaust ports entirely surrounding the cylinder, in order to have all sides of the cylinder in communication with the exhaust simultaneously, in

order to thoroughly exhaust the cylinder, as a single exhaust port will not thoroughly exhaust the cylinder, as the port is open such a short time that the gases do not have time to pass from one side across to the other, and it is for this purpose that my invention is more particularly designed. Having thus described my invention, what I claim and desire to secure by Letters Patent, is: I

1. A gas engine, comprising a cylinder having a series of inlet and exhaust openings surrounding the cylinder, one

above the other, an outwardly extending flange carried by the cylinder above the exhaust openings, a second flange carried by the cylinder between the exhaust and inlet series of openings, and screw-threaded, a casing screwed to the said flange and spaced a distance from the cylinder and having an outwardly extending flange abutting the flange carried by the cylinder above the exhaust openings, and a'piston within said cylinder and having means for conveying the mixture inward to the center of the cylinder.

2. A gas engine, comprising a cylinder having a series of inlet and exhaust openings, entirely surrounding the cylinder, andthe exhaust opening arranged above the inlet opening, an outwardly extending flange carried by-the cylinder above the exhaust openings, a second flange carried by the cylinder between the exhaust and inlet series of openings and screw-threaded, a casing screwed to said flange and spaced a distance from the cylinder, and having an outwardly-extending flange abutting the flange carried by the cylinder above the exhaust openings, a piston within the cylinder, radially-extending ribs carried by the upper end of said cylinder, and a cap carried by the ribs and having a central opening for discharging the explosive mixture inwardly and upwardly at the center of the cylinder.

3. A gas engine, comprising a cylinder having a series of inlet and exhaust openings surrounding the cylinder, one above the other, an outwardly-extending flange carried by the cylinder above the exhaust openings, a second flange carried by the cylinder between the exhaust and inlet series of openings, a casing having a tight joint with said flange and spaced a distance from the cylinder and having an outwardly-extending flange abutting the flange carried by the cylinder above the exhaust openings, means tor inlet ports and exhaust ports entirely surrounding the cylinder one above the other, and a piston having passageways extending inwardly to the center and adapted to convey the exhaust from the cylinderand to convey the charge to the cylinder, and whereby the heat of the exhaust is utilized to heat the charge as it passes to the cylinder, and also to clean the inlet supply ports of the piston.

6. A gas engine, comprising a cylinder having a series of inlet and exhaust openings entirely surrounding the cyl-' inder one above theother, an outwardly-extending flange carried by the cylinder above the exhaust openings, a second flange carried by the cylinder between the exhaust and inlet series of openings, a casing having a tight joint with said flange and spaced a distance apart from the cylinder 1 and having an outwardly-extending flange abutting the flange carried by the cylinder above the exhaust openings, means for securing the casing to thecylinder in said position, and a piston within the cylinder having passages extending inwardly to the center, and adapted to convey the exhaust from the cylinder and to convey the charge to the center of the cylinder, whereby the charge is heated in passing through the exhaust passage of the piston.

In testimony whereof I afllx my signature in presence of two witnesses. Y

DORVILLE LIBBY, JR.

Witnesses:

W. L. Erinrorr, Winn-man H. KELLOGG. 

